标题：Adsorption of basic Dye from Aqueous Solution using HCl Treated Saw Dust (Lagerstroemia microcarpa): Kinetic, Modeling of Equilibrium, Thermodynamic, INDIA
期刊名称：International Research Journal of Environmental Sciences
电子版ISSN：2319-1414
出版年度：2013
卷号：2
期号：8
页码：6-16
语种：English
出版社：International Science Community Association
摘要：In this work, experiments were conducted to explore the potential of saw dust activated with hydrochloric acid (ASD) as adsorbent for methylene blue (MB) removal. The influence of different variables like solution pH, MB concentration, contact period and ASD dosage were studied. Adsorption data were better fitted to the second order kinetics. Experimental equilibrium data were analyzed by various established isotherms and Langmuir isotherm was found to be better fitted one. Thermodynamic parameters like Gibbs free energy (G), change in enthalpy (H) and entropy (S) were estimated and the adsorption of MB onto ASD was found to be exothermic and favorably influenced by decrease in the temperature. A mathematical model for MB transported by molecular diffusion from the solution to the surface of ASD was derived and the values of liquid phase diffusivity and external mass transfer coefficient were estimated.
关键词：Methylene blue;Lagerstroemia microcarpa;kinetics;equilibrium;isotherms;mathematical model
